I have sciatic issues from hysterectomy about 40 yrs ago and no spasms here...I go thru periods when the sciatic nerve quiets down and then it acts up again when I go thru something like a horrible knee infection I had in 2016, long saga there and in hosptial and rehabs for 4.5 months, lying around and not walking caused more sciatic mess.

Learn some sciatic nerve stretches....they are out there to find.

Also, do you take magnesium which many in the world are deficient....lack of mag can cause spasms....you can find mega info on this support group on magnesium deficiency.

It's not even clear sciatic is your issue, is it Ontario.